22278123 has 12 divisors (see below), whose sum is σ = 36776688. Its totient is φ = 12730320.

The previous prime is 22278121. The next prime is 22278131. The reversal of 22278123 is 32187222.

It is a happy number.

It is not a de Polignac number, because 22278123 - 2¹ = 22278121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22278121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 176748 + ... + 176873.

It is an arithmetic number, because the mean of its divisors is an integer number (3064724).

Almost surely, 2^22278123 is an apocalyptic number.

22278123 is a deficient number, since it is larger than the sum of its proper divisors (14498565).

22278123 is a wasteful number, since it uses less digits than its factorization.

22278123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353634 (or 353631 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 22278123 is about 4719.9706566885. The cubic root of 22278123 is about 281.3797670800.

Subtracting 22278123 from its reverse (32187222), we obtain a palindrome (9909099).

The spelling of 22278123 in words is "twenty-two million, two hundred seventy-eight thousand, one hundred twenty-three".